Variation Analysis and Robust Fixture Design of a Flexible Fixturing System for Sheet Metal Assembly

Author:

Li Bing1,Yu Hongjian1,Yang Xiaojun1,Hu Ying2

Affiliation:

1. Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, P. R. China

2. Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China; The Chinese University of Hong Kong, Hong Kong, P. R. China

Abstract

Flexibility of assembly systems is crucial to maintaining the competitiveness in the rapidly changing market. In this paper, a novel flexible fixturing system for sheet metal part assembly is presented, which utilizes parallel robots as reconfigurable fixture elements. The method of influence coefficients, combined with finite element analysis and screw theory, is used to analyze the variations in sheet metal assembly. In the analysis of assembly variations, a total of six variations involved in prewelding, underwelding, and afterwelding process are intensively considered. Screw theory is employed to model the kinematic and constraint features corresponding to the fixturing schemes. A robust fixture layout design model is developed based on the Lagrangian conditional extremum method. A case study illustrates that the robust optimal methodology and an optimal fixture layout scheme with less sensitivity can be obtained.

Publisher

ASME International

Subject

Industrial and Manufacturing Engineering,Computer Science Applications,Mechanical Engineering,Control and Systems Engineering

Reference37 articles.

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